Looking for Language Reactor on Android? Here's what works on a phone

Updated 2026-11-13

Why the desktop setup does not follow you to your phone

Browser extensions live inside a desktop browser. On Android, most browsers either do not support extensions at all or support a narrow set of them, and mobile browsers rarely give an extension the access it needs to draw subtitles over a video player. On iPhone the situation is stricter still, which is why "language reactor iphone" searches mostly end with people installing a desktop browser workaround or giving up.

The other half of the problem is the streaming services themselves. Netflix and YouTube both push you toward their own apps on mobile, and those apps do not let outside tools sit on top of the player. You can still watch, but the layer that made watching into studying disappears.

• Extensions need a desktop browser; mobile browsers generally do not run them
• Netflix and YouTube mobile apps do not allow outside subtitle layers
• Small screens make two subtitle lines and pop-up dictionaries harder to fit
• Copying words into a notebook by hand is slow enough that most people stop

What you can still do on a phone without any extra app

Before adding tools, it helps to know what the phone already gives you. YouTube's own captions work in the mobile app, and many videos have creator-made subtitles in the original language. You can slow playback to 0.75x or 0.5x, which makes fast speech followable. On Android you can also turn on Live Caption in the accessibility settings, which transcribes audio playing on the device, though it does not translate.

A realistic phone routine looks like this: pick short videos, watch once with captions in the target language, then watch again at reduced speed and pause after lines you did not catch. Keep a notes app open and type the words you want to keep. It is clunkier than a click-to-save dictionary, but it works, and it costs nothing.

• Use creator subtitles where they exist; they are more reliable than automatic ones
• Drop the speed to 0.75x for listening practice, then back to 1x
• Watch in short sessions of five to ten minutes rather than long binges
• Say difficult lines out loud; the phone cannot hear you, so there is no embarrassment

How Popglot handles YouTube learning on Android

Popglot is built for exactly this situation: a phone in your hand, YouTube as the video source, and a learner who wants help with the language rather than a full desktop studio. You describe what you feel like watching in your own words, for example "funny street interviews about dating, ten minutes", and the app searches YouTube in the language you are learning. You can also browse curated channel feeds in twelve languages, or share any YouTube video from the YouTube app straight into Popglot.

Videos play in YouTube's official embedded player, ads included. Below the video you get two subtitle lines: the original with word-by-word highlighting as words are spoken, and a translation in your language. The app tells you where each track comes from, whether that is the creator's own subtitles, YouTube's automatic captions, machine translation or AI translation. Automatic captions can contain mistakes, so treat them as a helpful draft rather than a transcript.

• Subtitle modes: both lines, original only, translation only, tap to reveal, or audio first
• Tap a word for its meaning in that sentence, base form, pronunciation and an example; long-press for a phrase
• Player tools: replay the current line, jump between lines, 0.5x to 1.5x speed, pause after every line, scrolling transcript
• Each video card shows an estimated level such as B1 est. and how much you are likely to understand; these are estimates, not official CEFR assessments
• Saved words return as spaced-repetition flashcards; Pro adds clip flashcards that replay the exact moment in the video
• Live Listen turns the phone's camera on a TV or a lecture and shows live subtitles with translation; nothing is recorded
• The app itself is available in sixteen languages, and no account is required

Popglot compared with a desktop extension setup

The honest summary is that Popglot covers the YouTube half of the desktop experience on a device you always have with you, and does not cover Netflix. If your study plan is built around series on Netflix, a phone app will not replace your laptop workflow. If most of your input comes from YouTube, the gap is much smaller than you might expect.

There is also a difference in what the two kinds of tool are. A browser extension adds a layer to a site you are already using. An app is a separate place to watch, which means one extra step to open it, but also a place where your saved words, review queue and level estimates live together.

• What Popglot does: YouTube videos with dual subtitles, tap-to-look-up words, phrase selection, saved words, spaced-repetition review, clip flashcards on Pro, Live Listen, an Android TV app
• What Popglot does not do: no Netflix, Disney+ or other streaming services, no local video files, no iPhone or iOS version, no browser extension
• Translation sources are always labelled, and free machine translation is unlimited; Pro adds natural AI translation and unlimited explanations
• Free plan: unlimited watching and reviews, 15 AI word explanations a day, 3 AI searches a day plus unlimited search in the curated library, 100 saved words, 10 minutes of Live Listen a day
• Pro: about US$4.99 a month or US$29.99 a year with a 7-day free trial on the yearly plan; prices are shown in local currency and vary by country, and billing goes through Google Play
• Popglot is not made by or affiliated with YouTube, Google or Language Reactor

A phone routine that actually sticks

Whichever tool you use, the routine matters more than the features. Choose one short video a day rather than a long one you will abandon. Watch it once for meaning, then a second time with the translation hidden and the original visible. When a word stops you, look it up, save it, and move on; do not try to learn every unknown word in a ten-minute clip.

Then let review do the quiet work. Five minutes of flashcards on the bus is worth more than an hour of re-watching on Sunday. If you are using Popglot, the saved words come back automatically on a spaced-repetition schedule, and there is an optional daily reminder if you want one. There is no streak pressure, so a missed day is just a missed day.

• One video, watched twice, beats five videos watched once
• Hide the translation on the second pass and reveal it only when you are stuck
• Save fewer words than you are tempted to; ten solid ones are enough
• Review the next day, not the same evening

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